362 University of California Publications. [botany 



small or no projecting upper angles, yet usually more pronounced 

 than in the preceding form. In the least development, it is the 

 plant described and figured by Yendo, but while this may have 

 the appearance of being di- to triehotomous, the more highly 

 developed plant is more or less regularly pinnate and even 

 bipinnate. It passes insensibly into the last and into the forms 

 which are usually included under Ampliiroa Orbigniana, which, 

 in a less than usually slight condition of development, is repre- 

 sented by Harvey in the Nereis Australis (Plate 38) and commonly 

 found on the coast of California. 



Amphiroa tuberculosa f. Orbigniana (Deeaisne) Setchell and 

 Gardner comb, now 



Although we have not seen a specimen of this form from our 

 territory, it seems best to include a brief discussion of it, because 

 of its relations, as indicated above, to the other forms. In its 

 typical condition it is a long plant, equal in this respect to any 

 plants we have seen of either of the two preceding forms. Its 

 joints are thinner and more distinctly auriculate than those of 

 the preceding form, with pinnate branching well marked. It 

 passes into the preceding as the joints become thicker and shorter, 

 with the auricles reduced or lacking. It also passes into a form 

 with lax and apparently subdichotomous branching, and this is 

 represented by the Amphiroa Orbigniana of No. 398 of Collins, 

 Holdeu and Setchell, P. B.-A. (in our copy), which is character- 

 istic of warmer waters. In the upper and more exposed portions 

 ot its habitat, it becomes dwarfed, the branching is more regular 

 and pronouncedly pinnate, and it passes over into the next two 

 forms. States of this form will probably be found at some time 

 in the warmer waters of the Puget Sound region. 



Amphiroa tuberculosa f. frondescens (P. & R.) Setchell and 

 Gardner comb, now 



On rocks in the litoral zone. West shore of Amaknak Island, 

 Hay of I'nalaska. Alaska, W.A.&. and A.A.L., No. 4004!; 

 Unalaska. Alaska, Posteh and BupreeM (1840, p. 20, under 

 Gorallina frondescens) ; Harvester Island, Uyak Bay, Kadiak 

 Island, Alaska, W.A.S. and A.A.L., No. 5129a! ; Port Renfrew, 



